关闭Tomcat Apache时出现Flex错误

Question

关闭Apache时，我在Tomcat控制台中收到以下错误。

SEVERE: The web application [/xxxxxx] created a ThreadLocal with key of 
type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@185ad79]) and a value of 
type [flex.messaging.client.FlexClient] (value [flex.messaging.client.FlexClient@1401d28]) 
but failed to remove it when the web application was stopped. This is very likely 
to create a memory leak.

我正在使用Flex 3.6A和Tomcat Apache 6.0.39。

我觉得我没有在ServletContextListener中优雅地关闭Flex，但我找不到这样做的命令。